Irresponsible (R, not F) (8)

I believe the answer is:

reckless

(Other definitions for reckless that I've seen before include "Utterly unconcerned for the consequences" , "Wildly incautious" , "Foolhardy, rash" , "Devil-may-care" , "Lacking caution, wildly impulsive" .)

I've seen this clue in The Times.

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